JPS61259292A - Display circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a display circuit for a system using a microcomputer, and particularly to a display circuit using a plurality of LEDs (light emitting diodes).
This invention relates to a display circuit that uses a dynamic method to light up a display.

[Conventional technology]

Conventionally, in a system using a microcomputer, a dynamic method has been used to light a plurality of LEDs.

[Problem that the invention seeks to solve]

However, when the number of LEDs becomes very large, the L
Since the ED appears to flicker, it is necessary to reduce the scanning speed very much, which has the disadvantage that it cannot be displayed completely due to the limited speed.

This invention was made to solve these problems, and it is possible to display without using a microcomputer at all times, and the storage circuit for storing the display program is also small-scale. An object of the present invention is to obtain a display circuit that can light up many LEDs.

[Means for Solving the Problems] A display circuit according to the present invention is provided with a display-only register for lighting a large number of light emitting diodes.

[For production]

In this invention, the contents of the register are sequentially read out by a counter and the light emitting diode is turned on.

〔Example〕

Embodiments of the display circuit of the present invention will be described below with reference to the drawings. As an example, a case will be described in which a plurality of LEDs of a central control unit are turned on in a central monitoring device for an air conditioner. do.

FIG. 1 is a circuit diagram showing a display circuit of the present invention applied to this central control unit. In FIG. The terminals D1 and CK2 of the counter 70 are connected to the input terminal of the inverter 74□, the A2 terminal is connected to the input terminal of the inverter 742 and the NOR circuit 75□0 input terminal, and the B2 terminal is connected to the input terminal of the inverter 743. The C2 terminal is connected to the decoder 72D terminal D□, and the B2 terminal is connected to the input terminal of the NOR circuit 752 and the input terminal of the NOR circuit 752.
7□.

Connected to the Do terminal.

The output terminals of the inverters 741 to 743 are NAND circuits 75
It is connected to a decoder 720E terminal via an o1 inverter 74°. Inverter 74□~743, NOR
Circuits 75□, 752. The blanking circuit 82 is composed of the NAND circuit 75o1 inverter 744. The output of decoder 72 is configured to output to driver 73.

The output of this driver 73□ is for each column line 78 of the LED 77.
-81 are driven, and each row line of this LED 77 is driven by the output of drivers 732-734.

FIG. 2 is an enlarged view of one of the LEDs 77, and each of the LEDs 77 is connected between a row line and a column line.

The control line 84 is connected to the inverter 74. , 74. are connected to the WA and WR terminals of registers 71□ to 716 through
It is directly connected to the Ew terminal.

In addition, the signal l1I85 is applied to each register 711 to 716°D.
It is connected to the 0 terminal to the D3 terminal. Registers 71□ and 71. , 713 and 714. 715 and 71. are the trap drivers 73□~734 and the resistors 761~7, respectively.
Each LED 77 is driven through the LED 63.

Note that the signal line 85 is connected to the register 71. This is for sending data to ~716. Before, registers 711-71.
are each 4×4 registers. 764-76
6 is a resistor for lowering the voltage.

Next, one or more air conditioners each having a terminal control device to which the display circuit of the present invention is applied are installed in each of a plurality of rooms, and each of these terminal control devices is centrally controlled by the central control device. The entire air conditioning system will be described below.

FIG. 4 is a system diagram showing the overall configuration of the air conditioner centralized monitoring device. In FIG. 4, l is a central control unit that controls the entire system (hereinafter referred to as the master unit), la is a sub-central control unit (hereinafter referred to as the sub-master unit) that has exactly the same functions as the master unit 1, and 2 is a terminal control device (hereinafter referred to as a child unit) that operates an air conditioner (hereinafter referred to as an air conditioner) 3 under the control of the main unit 1 or sub-main unit 1m; 4 is the main unit 1 and sub-main unit 1m; This is a communication line such as a coaxial cable that transmits signals between 1a and slave unit 2.

9. In the figure, A to F are the rooms where the air conditioner 3 is installed, and the air conditioner 3 has different air conditioning capacity, room volume, size, etc. depending on the case where only x units are installed or multiple. Sometimes a stand is installed.

FIG. 5 is an external view showing the operation unit (front) of the main unit 1, which is used to perform all operations such as starting and stopping the air conditioner 3 installed in each room. It consists of various operation switches, indicator lamps, etc.

That is, reference numeral 5 denotes an illuminated power switch, and when the power supply is normal, when the power switch 5 is turned on, the push buttons of the other switches are illuminated.

Reference numeral 13 denotes an operation switch, and the operation of this switch 13 controls the operation and stopping of the air conditioner 3 in each room.

15 is an operation command lamp, which is turned on and off by operating the operation switch 13. When it is lit, it instructs the air conditioner 3 to operate, and when it is off, it instructs the air conditioner 3 to stop. Indicates that the instructions are given.

14 is an external control lamp, EI A-R8232
C-compliant standard interface Lights up when functions such as the operation switch 13 are performed by an external computer system.

Reference numeral 16 denotes a monitoring lamp, which lights up when the air conditioner 3 is in operation.

17 is a house name card that can be freely replaced and displayed, and includes the name of the room controlled by the operation switch 13, and the number displayed on this card 17 is 3 in this embodiment.
Each of the two operation switches 13 is identified.

Furthermore, 7 is a simultaneous operation switch, and by operating this switch 7, only the air conditioners 3 that have been set to the operation state by the operation switch 13 can be operated at the same time. The light will be displayed.

Reference numeral 6 denotes a key lock switch, and by operating this switch 6, all inputs made by operating the operation switch 13 are ignored, and the indicator lamp 18 lights up to indicate the operation.

A gas leak alarm lamp 9 lights up when a gas leak alarm 3o, which will be described later and is connected to the handset 2, detects a gas leak.

Reference numeral 10 denotes an operation warning lamp, which lights up when the air conditioner 3 performs an operation different from the command from the main unit 1.

Reference numeral 11 denotes a communication 1 notification lamp, which lights up when communication is not performed normally due to disconnection or short circuit of the communication line 4.

Reference numeral 12 denotes an operation request lamp, which is turned on when an operation request switch 29, which will be described later and is connected to the handset 2, is turned on. 8 is a speaker, the gas leak alarm lamp 9, operation alarm /
When any one of the main unit 10, the communication alarm lamp 11, and the operation request lamp 12 is lit, this is notified by an alarm sound. Fig. 6 is an external view of the main unit 1, showing the R side. It is a diagram. 2
0 is a switch 7f for setting the system state;
21 is a connector for connecting the EIA-R8232C standard interface, 22 is a setting switch for setting the communication method of the standard interface, etc., 23 is a volume for adjusting the volume of the alarm sound, and 24 is a connection for connecting the signal line 4. Orange, 25 is a ground terminal for grounding, 26 is a 20 type outlet provided to conveniently use other electrical equipment at the same time, and 27 is a power plug for receiving commercial power supply.

FIG. 7 is a block diagram of the configuration of the terminal side.
, an operation request switch 29, and an external sensor 28 whose contacts are turned on/off depending on the set temperature are connected to each of them.

FIGS. 8(a) and 8(b) are external views of the handset 2, with FIG. 8(a) being a plan view and FIG. 8(b) being a front view. In FIGS. 8(a) and 8(b), 3] is a connector for connecting the air conditioner 3, 32 is a connector for connecting the gas leak alarm 3o, 33 is a connector for connecting the external thermostat 28, 34 is a plug for connecting the signal line 4, 35 is an identification number setting 5ix switch for setting a slave unit identification number, and 36 is a mounting terminal for connecting the operation request switch 29.

FIG. 9 shows a circuit 1772 of the main unit 1 and the sub-main unit 1a.
The figure shows a microcomputer 4o as the center, a storage circuit 43 for storing programs, an EIA-R8232C compliant standard interface circuit 37, and FSK modulation/demodulation for communicating with the handset 2. a modem circuit 38, the external control lamp 14,
A display circuit 39 that flashes display lamps such as the operation command lamp 15, a switch input circuit 41 that provides input to switches such as the operation switch 13, an alarm sound generation circuit 44 that generates the alarm sound, etc.; It is constituted by a power supply circuit 42 that supplies power.

FIG. 1O is a block diagram showing details of the power supply circuit 42. As shown in FIG. 45 is a stabilized power supply; 47 is the memory circuit 43;
46 is a comparison circuit that measures the voltage of this battery 47 and determines its degree of consumption; 48 is a comparison circuit that measures the voltage of this battery 47 to determine its degree of consumption; 48 is a comparison circuit that, when energized, 6 supplies power to the memory circuit 43 from the stabilized power supply 45; , is a switching circuit for switching it to the battery 47 in the event of a power outage.In this way, the power for the memory circuit 43 is supplied from the output of the switching circuit 48, and the power for other circuits is supplied from the stabilized power supply 47. and comparison circuit 46
The output of is connected to the microcomputer 40.

FIG. 11 is a circuit diagram showing the connection between the handset 2 and the air conditioner 3, and the air conditioner 3 is taken as an example of a gas heater. 4
9 is a power plug for supplying commercial power; 51 is an automatic/manual changeover switch for switching whether the air conditioner 3 is operated by central control or independently and manually;
50 is a main switch for turning on/off the power of the air conditioner 3 during manual operation; 53 is a self-holding switch to prevent the air conditioner 3 from being restarted even if no action is taken due to re-energization after a power outage; 54
52 is a self-holding relay that is closed when the control circuit 54 is energized by the operation of the self-holding switch 53; 57 is a control circuit for controlling the combustion sequence in the air conditioner 3; The handset control circuit 55 and 56 are relay contacts A and B that are remotely controlled by the handset 1, which performs functions such as communication.
and the air conditioner 3 are connected by six electric wires.

FIG. 12 is a block diagram of the handset control circuit 57.

58 is the gas leak alarm 30. Operation request switch 29
and an external input circuit for connecting the external thermostat 28, 59 a microcomputer, 60 an air conditioner connection circuit for connecting the air conditioner 3, 61 a modulation/demodulation circuit for communicating with the main unit 1, and 62 a welfare slave unit. This is an identification number setting circuit for identifying 2.

Next, we will discuss the operation of the air conditioner centralized monitoring system.

First, the operating conditions are initialized.

Here, as shown in FIG. 4, the main unit 1, the sub-main unit 16
, the slave units 2 are connected to each other by a signal line 4, and one air conditioner 3 is connected to each slave unit 2.

In addition, for each handset 2, an identification number setting switch 35
For example, one of the handsets in room A is number 1, and one of the handsets in room B is number 2, and so on. At this time, these numbers 1, The second identification number corresponds to the identification number of the operation switch 13 of the base unit 1, respectively.

When two air conditioners 3 are installed in one room, as in room B, by setting the first unit to number 2 and the second unit to number 34, the main unit 1 of 2-
All 92 units can be controlled by the operation switch 13 in 1).

Tsuma), the first air conditioner installed in room B 30 slave units 2
If it is set to number n (0≦n≦31), the child unit 2 of the second air conditioner 3 becomes number n+32.

In addition, as shown in Figure 4 above, there is also a secondary master unit la in the same system.
When installing a slave unit 2 for this sub-base unit 11,
Since the identification number is set in the same manner as in the above, at this time, the identification number set in the sub-master device 1a cannot be used for the gold-plated device 2. The identification number of the sub-base unit 1a is from 0 to 3.
You can set it to any number up to number 2, and the sub-base unit 1
In this case, a can be any number of units as long as it is 32 or less, but in this embodiment, there is one sub-base unit 1a, and its identification number is set to 0.

That is, by setting in this way, the secondary master unit 1a
Since there is K, the identification number setting switch 35 similar to that of the handset 2 can be omitted.

Note that if this sub-base unit 1a is not installed, the number 00 can be used as the identification number of the slave unit 2.

Furthermore, after setting the identification number of the slave unit 2 in this way, write the house name in the corresponding number of the master unit 10 room name car) '17 to make it easier to operate.

Next, in order to enable the base unit 1 to discover a malfunction in the slave unit 2, it is necessary to inform the base unit 1 of how the slave unit 2 is installed within the system.
Switch the changeover switch 20 provided on the base unit 1 to the slave unit 2.
is switched to the initial setting position (not shown), and the presence or absence of the slave unit 2 is set by operating the operation switch 1.3.

Specifically, for example, when trying to set the room with identification number 0, if there is only one slave unit 2 (air conditioner 3) (the only identification number is 0), press the operation switch 13 once. When pressed, the operation command lamp 15 lights up, indicating that there is only one slave unit 2 in the room number 0, and if there are two slave units 2 (air conditioner 3), the operation command lamp 15 is turned on. When you press it once, both the operation command lamp 15 and the external control lamp 14 will light up, indicating that there are two slave units 2 in room No. 0, so you can also check for any incorrect settings. Therefore, when the operation switch 13 is pressed once more, both the operation command lamp 15 and the external control lamp 14 go out and return to the initial state, thereby confirming that the settings have been made correctly.

In this way, all settings for identification numbers 0 to 31 are made.

At this time, the operation switches 13 whose identification numbers have no handset 2 installed are left in their initial state.

In addition, each of the slave units 2 has a tfX leak. alarm 3
0, the operation request switch 29 and the external thermostat 28 can be connected, but of these, except for the operation request switch 29, it is necessary to notify the main unit IK that they are connected.

In this case, in the same way as when setting the installation state of the handset unit 2 described above, switch the selector switch 20 to the gas leak initial setting or external thermostat initial setting (both not shown), and turn the operation switch 13. Operate and do it.

However, in this case, unlike the initial settings of handset 2, the settings for the OII room, for example, must be made.

It is possible that this gas leak alarm 30 is connected only to slave unit 2 in room No. 32, so switch operation switch 1.
When 3 is pressed three times from the initial state, the setting is made only for the handset 2 in the daughter's room No. 32, and only the external control lamp 14 is turned on.

In other words, every time you press the operation switch 13, the number 0 slave unit 2
(only the operation command lamp 15 lights up) → Connects to the handset 2 of numbers 0, 32, and 32 (the operation command lamp 15 and external control lamp 14 light up) → Connects only to the handset 2 of number 32 (external Only the control lamp 14 lights up) → Both the slave units 0 and 32 are not connected, and the lamps 15 for both operation command and external control
．． 08
Settings from 31 to 31 are made.

In this way, all initial settings are made, but with the changeover switch 2o returned to the original operating position, each air conditioner 3 will not operate automatically against the user's will. In order to achieve this, in the apparatus of this embodiment, the -switch 7 is always kept in the OFF state.

That is, FIG. 13 shows a flowchart for correcting the contents of the initial settings. Although the example shown in FIG. 13 is the case of initial setting of the slave device, other initial settings are also almost the same.

In the flowchart of FIG. 13, first, the set state of the changeover switch 20 is determined in step s1, and if it is not at the initial setting position of the handset, the process moves to the next process, and when it is at the initial setting position of the handset, step S2 Then, the simultaneous operation switch 7 is set to 0FFKL, and then it is determined whether or not the operation switch 13 has been pressed. Here, if you drive in? 1
If 3 was not pressed, press the changeover switch 20 again.
If the operation switch 13 is pressed (step S3), the value of the cutter (::n (n indicates the number of the operation switch 13 that was pressed) inside the microcomputer is set to 1. Glass step S4
), then if the value of KCn is 1 (step S5), the operation command lamp 15 is turned on, and if the value of Cn is 2'''c (step 86), in accordance with the illumination of this operation command lamp 15, The external control lamp 14 is also turned on (step 87).
), and the value of Cn is neither 1 nor 2, step S
In step 8, this value is set to 0 and both the operation command lamp 15 and the external control lamp 140 are turned off (step 89).Next, after this process, this value of Cn is transferred to the memory circuit 43 (step 810), and the first switching is performed. The set state of the switch 20 is determined.

Note that the same operation is performed when changing the initial settings.

Subsequently, after completing the initial settings as described above, one individual control operation is performed.

First, the changeover switch 20 is set to the operating position (not shown), and the procedure for operating the air conditioners 3 No. 0 and No. 32 in this state will be described.

In this state, as mentioned above, the operation switch No. 0
Each time you press 3, only the operation command lamp 15 is lit, only the external control lamp 14 is lit, and both pumps are turned off, so operate the number 0 operation switch 13 to turn on only the operation command lamp 15. state. Then, by pressing the simultaneous operation switch 7 once, the display lamp 19 lights up, and the modem circuit 61 of the master unit 1 starts operation for each slave unit 2 of Nos. 0 and 32 via the signal @4. signal is given. This procedure is shown in the flowchart of FIG.

That is, first, in step 811, the state of the n-th driving command lamp 15 is determined. And this operation command lamp 1
5 is lit (step 812), it is determined whether or not the -simultaneous operation switch 7 is in the ON state, and if it is in the ON state, it is further determined whether the n-th air conditioner 3 is already in the operating state. (Step 513), if it is in the operating state, the process ends; if it is not in the operating state, in step S14, both the relay contact A55 and the relay contact 856 are turned ON in the slave unit 2.
After giving the signal to
It is turned FF and the process ends (step 815).

Further, when the operation command lamp 15 is not lit or when the simultaneous operation switch 7 is not ON, both relay contact A55 and relay contact B56 are turned OFF and the process ends (step 816).

In this way, the operation of the air conditioner 3 can be remotely controlled, and the operation of the air conditioner 3 in this case by opening and closing the relay contacts A55 and B56 of the slave device 2 will be described later. In the case of this embodiment, a gas heater is used as an example, but if it is another type of air conditioner that can be started and stopped only by relay contact A55, relay contact B56 can be omitted, and it will be even better. It gets easier.

Further, as is clear from this flowchart, the simultaneous operation switch 7 can be turned ON first, and then the operation switch 15 can be operated to start or stop the operation.

Furthermore, since the -simultaneous operation switch 7 is related to all slave units 2, the -simultaneous operation switch 7 is turned ON.
, all by the OF'F operation! 2! It is possible to operate and stop the preparation machines 3 all at once.

Next, a case will be described in which the air conditioner 3 is controlled by giving a master unit IVc command from the outside using the EIA-R8232C standard interface.

First, connect the EIA-R8232C standard interface to the EIA-R8232C standard interface connector 21 of the base unit I.
A computer system with a CLL quasi-interface is connected, and the communication method (for example, baud rate, presence or absence of communication, etc.) is set using the setting switch 22. In this state, commands from the external device are input to the standard interface circuit 37 and are processed by the microcomputer 40. A flowchart for executing the commands by the microcomputer 40 is shown in FIG.

That is, the command input to this standard interface circuit 37 (step 817), for example, the command to operate slave unit 2 numbered 0, is "Sn" (n is any number from 0 to 31). This input command is decoded by the microcomputer 40 in step S18. When this decoded command is to operate the n-th slave unit 2 in step 819, and the n-th external control lamp 14 is on (the operation switch 1
3) (step S20), step 521 is executed to operate this n-th slave unit 2 (step S20).
), the n-th driving command lamp 15 is turned on at the same time (1), therefore, at this time, both the driving command lamp 15 and the external control lamp 14 are turned on (step 522).

Further, if the decoded command is to stop the n-th slave unit 2 (step 523) and the n-th external control lamp 14 is lit (step 524), then the n-th
Step 825)
At the same time, the n-th operation command lamp 15 is turned off (step 526).

Therefore, from the outside like this, EIA-R8232
The C standard interface makes it possible to control the operation and stop of the handset 2, but even if it is controlled from the outside, if the external control lamp 14 is turned off by operating the operation switch 13, It is also possible to remove this external control and switch to control by the base unit 1.

Next, power failure compensation for the memory circuit 43 in the base unit 1 will be described.

In the base unit 1, the initial settings and operation command status are stored in the RAM of the storage circuit 43. Therefore, if the power supply is stopped due to a power outage, the data stored in this RAM will be lost. When you turn on the power again, you will have to reset the initial settings again.

Therefore, in order to solve this problem, the contents stored in the memory circuit 43 are compensated and protected by the battery 47.

Here, 5V is normally used as a power source for the memory circuit 43, and is supplied from a stabilized power source 45, but the voltage of the battery 47 may be different from the voltage of this stabilized power source 45. By using a low voltage of about 3.5V, the stored contents can be retained.

Now, when the commercial power supply is stopped due to a power outage or the like and the voltage of the stabilized power supply 45 drops below the voltage of the battery 47, the power supply to the memory circuit 43 is automatically switched to the battery 47 by the switching circuit 48. The voltage of the stabilized power supply 45 is reduced to the battery 47 by continuing to hold the memory contents and by reenergizing.
When the voltage becomes higher than , the power supply from the stabilized power supply 45 is restored again.

In addition, if the battery 47 is exhausted due to repeated power outages, etc., the battery 47 cannot compensate for the power outage, so the voltage of the battery 47 is constantly monitored by the comparator circuit 46, which maintains a constant voltage value. For example, when the voltage drops to 3.0 V, it is determined that the battery 47 has reached the end of its service life, and the administrator is notified of this.

That is, specifically, the output of the comparison circuit 46 is inputted to the microcomputer 40, and the output is used to cause the light-emitting power switch 50 to flash and display.

Next, the function of the key lock switch 6 will be described.

This key lock switch 6 is provided to prevent the operation switch 13 from being operated by mistake, and is turned on after the operation switch 13 is set to operate or stop the air conditioner 3. Therefore, even if a person other than the administrator accidentally touches the operation switch 13 afterwards, the microcomputer 40 can ignore the input when the key lock switch 6 is ON, and the input will be ignored by the user. This makes it possible to prevent the air conditioner 3 in the room from operating.

However, in this case, only key inputs from the operation switch 13 are ignored, and key inputs from other switches are valid. This is other than operation switch 13.) If yes,
This is because even if an operator makes a mistake, all the air conditioners 3 will not stop, and since this can be detected reliably, it will be easier for the administrator to use the system if it is not ignored. Note that when the key lock switch 6 is turned on, the display lamp 18 is turned on, and the display lamp 18 can be released by pressing the key lock switch 6 again.

The above is the operation method for the base unit 1. Next, the operations of the child unit and the air conditioner 3 will be described.

As mentioned above, the air conditioner 3 has a function for selecting and switching whether to operate the air conditioner 3 independently (hereinafter referred to as manual operation) or remotely controlled by the main unit 1 (hereinafter referred to as automatic operation). An automatic/manual changeover switch 51 is provided.

That is, in FIG. 11, contacts e and g of this automatic/manual changeover switch 51 are in automatic operation, and contacts f and h are in manual operation.

First, we will discuss the case where the air conditioner 3 is operated manually.
Select the automatic/+motion selector switch 51 to the manual operation side,
After turning on the main switch 50 for this manual operation and temporarily turning on the self-holding switch 53, the control circuit 54 is energized and the self-holding relay 5
2 is turned ON, and thereafter this self-holding switch 53 is turned OFF.
Even if P is applied, the control circuit wI54 continues to be energized by self-holding by the self-holding relay 52, and by this operation, the air conditioner 3 can be operated manually, and this self-holding is applied. This is notified to the handset 2 by applying a commercial power supply of 100 V between a and d of the handset control circuit 57.

Further, by turning the main switch 50t-OFF'F', the power supply to the control circuit 54 is cut off, and the self-holding relay 5
2 is also turned off, and naturally the air conditioner 3 stops. For example, if an abnormality such as a misfire occurs while the air conditioner 3 is in operation, the control circuit 54 turns off the self-holding relay 52 to cut off the power supply to itself.

Next, a case will be described in which the air conditioner 3 is automatically operated.

By selecting the automatic/manual changeover switch 51 to the automatic operation side, a commercial power supply of 100 V is applied to the slave unit control circuit between a and c of □, and the slave unit 2 is notified that this mode is automatic operation. Let me know. Then, in this state, base unit 1
Relay contact A55, relay contact B5
6 are simultaneously KON, the control circuit 54 is energized and the self-holding relay 52 is turned on as in the case of manual operation.
Even if the relay contact B56 is turned off after that, the control circuit 54 is maintained by self-holding by this self-holding relay '52.
The air conditioner 3 can be operated automatically by continuing to be energized, and at the same time, a commercial power supply of 100 V is applied between a and d of the slave unit control circuit 57, indicating that this self-maintenance is applied. Notify handset 2.

Similarly, if an abnormality such as a misfire occurs during operation, the control circuit 54 turns off this self-holding relay 52 and cuts off the power supply to itself.

That is, in the handset 2, by monitoring the voltage between & and e of the handset control circuit 57, it is possible to determine whether the air conditioner 3 is in automatic operation or manual operation, and similarly. By monitoring the voltage between a and d, it can be determined whether or not the air conditioner is energized regardless of the operation.

Next, a case where an external thermostat 28 for controlling the temperature of the air conditioner 3 is connected to the slave device 2 will be described.

At this time, be sure to set air conditioner 3 to automatic operation, and
The signal from the external thermostat 28 attached to the external input circuit 5
8 to the microcomputer 59, and transmits it from the modulation/demodulation circuit 61 to the base unit 1 via the signal line 4.The base unit 1 receives the signal and sends it to the slave unit 2 according to the program shown in the flowchart shown in FIG. send a signal.

That is, as is clear from this flowchart, n
When the signal of the external thermostat 28 is input from the number slave unit 2 (in this system, n is 0 to 63) to the base unit 1 (step 527), first, the n number slave unit 2 is It is determined whether the external thermostat 28 is attached to (step 828), and if the attachment of this external thermostat 28 is instructed, then if n1I(n)31, then n-32) It is determined whether or not the operation command lamp 15 is lit (step 529), and when this operation command lamp 15 is lit, it is further determined whether the simultaneous operation switch 7 is turned on (step 830). .

Then, if the simultaneous operation switch 7 is ON, the external thermostat 28 is turned ON (step 531) to eliminate the process of operating the air conditioner 3 (step 532), and if it is OFF, the process of stopping the air conditioner 3 is performed. However, if any of these initial settings, operation commands, and -simultaneous operation does not apply, no processing is performed (step 53).
3).

Also, a method for monitoring the operation and stoppage of the air conditioner 3 will be described here.

First, when one air conditioner 3 is installed in one room, whether or not this air conditioner 3 is operating is determined by the voltage between a and d of the slave unit control circuit 57 (when in operation, the voltage is 10
0V is applied, and OV when stopped) is determined by the 22 modulator connection circuit 60 of the slave unit 2, and this is notified to the microcomputer 59 of the slave unit 2, and the modulation/demodulation circuit 61 transmits it to the base unit via the communication line 4. Communicate to l. Then, in the base unit 1, this signal is received by the modulation/demodulation circuit 38, judged by the microcomputer 4o, and the n-th slave unit 2 (in this case, n is 0 to
31 (32 to 63 will be described later) is in operation, the n-th monitoring lamp 16 is turned on, and if it is stopped, it is turned off.

Next, when two air conditioners 3 are installed in one room, it is not as simple as described above, but as shown in chart 70 in FIG. 17.

That is, a signal indicating the operating status of the air conditioners 3 No. n and No. n+31 is input (Step 534), the operation command lamp 15 of No. n is lit (Step 535), and an operation command is being issued to the slave unit 2 of No. n. (step 536), then this n
Only when slave units 2 No. and No. n+31 are both in operation (Step 537), the monitoring lamp 16 No. n is turned on (Step 838), and is turned off at other times (Step 539).

On the other hand, when the n-th operation command lamp 15 is not lit (step 840), this n-th, n+
The monitoring lamp 16 of No. n is turned off only when both slave units 2 of No. 31 are stopped, and if either one is in operation (step s4□), the monitoring lamp 16 is turned on.

Furthermore, based on the information from the slave unit 2, the base unit 1 displays the location of the abnormality and the type of abnormality when the following abnormality occurs in the system, and also issues an alarm. The function to call is given.

In other words, 0) Communication abnormality alarm when communication with slave unit 2 is not possible, ■ When air conditioner 3 does not start even though it was tried to operate, or when it did not stop even though it tried to stop it. Operation abnormality alarm, ■ Gas leakage when the gas leakage alarm 30 detects a gas leakage abnormality, and when the gas leakage alarm 530 is malfunctioning or the communication line 4 connecting the handset 2 and the gas leakage alarm 30 is abnormal. alarm.

■Driving request call to notify that a driving request has been made by turning on the driving request switch 29 connected to the handset 2, which is different from the obituary notification.

If an abnormality occurs in any of these four items, if the abnormality is n or n+31, handset 2, n
The number monitoring lamp 16 is blinked, and each alarm lamp corresponding to the abnormality is turned on. In other words, the above ■
When , communication alarm lamp 11, when ■, operation alarm lamp 1
0. In the case of ■, the gas leak alarm lamp 9 is lit, and in the case of ■, the operation request lamp 12 is lit, and at the same time, the administrator is alerted from the alarm sound generation circuit 44 through the speaker 8. In this case, it is possible to classify each abnormal state by changing the sound range, etc., but here, since the abnormal states are classified by each lamp display, such a method is not particularly necessary. It may be used when it is necessary to classify the contents of the W report again, for example, when classifying the time when a gas leak is detected and the time when a failure occurs.

Furthermore, the above-mentioned abnormal state display, obituary notification, call, etc. are not only applicable when one air conditioner 3 is installed in one room, but also when two air conditioners 3 are installed in one room. 1st
According to the flowchart shown in FIG. 7, the process can be executed when the operation command and the monitoring result are different.

Next, the operation of the present invention will be explained with reference to FIGS. 1 to 3. FIG. 3 is a time chart showing the output waveforms of each terminal in FIG. 1. This figure 3 (- to figure 3 (i) shows the signals from point a to point i in figure 1. First, the LED
This section describes the circuit operation when the light is on.

When a signal obtained by frequency-dividing the system clock used in the microcomputer of this system is input to the CK□ input terminal of the counter 70, the frequency-divided waveform is transmitted to the C2,
The signals are outputted from D2 as shown in FIG. 3(b) and FIG. 3(a), respectively, and inputted to successive address terminals Ra and RB of each register 71□ to 71.
The contents of the data stored in the registers each having four pits are sequentially outputted from the terminals Q1 to Q4 of the process 716.

At the same time, the signal of c2p D2 is sent to D□ of the decoder 72.

When inputted from D2, Y of the decoder 72 is inputted sequentially. -Y3
The “L” signal is output at the end, and the “L” signal is output as shown in Fig. 3 (f) to Fig. 3 (h).
, the terminals that output the @H''' signal among the Ql-Q4 terminals of registers 71□ to 716 are drivers 73□ to 7
34 drives the LED 77.

In other words, when the Do and D1 terminals of the decoder 72 are both low signals, the column line 78 is selected, and each register 71□ to 71
．． The decoder 72 turns on or off depending on the data. When the terminal is "H" and the D terminal is "L" signal, column line 7
9 is selected, and the light is turned on or off according to the data in each register 71□ to 716. Similarly, the column lines 80 and 81 are terminals of the decoder 72. , D□. By repeating this one after another at a fast speed, it is as if all LE
It looks like it is driving the D77.

Next, we will discuss when to change the display content.

The register 71. to be changed is controlled by a signal from the control @84 from the microcomputer. ~716°Ew Set the terminal to "H" and use the WA and WB terminals.

The corresponding 4 pits of the 4×4 bit data of Stuff 1 are selected by the 'H' @ L II flaw signal, and the data are changed to Reno Stuff 1. to 71.OD by the signal Im!85.
-D3 terminal, register 71. The display contents are written at 71 degrees.

Next, the blanking circuit 82 will be described. The LEDs to be driven are sequentially selected by the decoder 72 on the column lines 78 to 81, but at the moment when the selection changes, due to the delay time in the signal transmission speed, two columns are selected at a certain timing, so the display is not displayed. There are times when the display differs from what you want it to display.

Therefore, D. In order to eliminate the time during which two columns are selected by creating a time period in which none of the column lines 78 to 81 is selected for a certain period of time before and after the terminal and the D When the E terminal is set to @H'' signal, all the terminals of the decoder yo-Y3 are '
The LED is completely turned off so that the signal becomes "H". This time is so short that it can hardly be visually confirmed, so it is not a problem in use.

Although the above embodiment describes the display circuit of the central control unit in the air conditioner centralized monitoring system, it can also be applied to the display circuit used in an external microcomputer.
Although we have described a gas heater as the air conditioner 3, other air conditioners may also be used.

Although the communication line 4 is used for communication between the base unit 1 and the slave unit 2, a power line may also be used.

〔Effect of the invention〕

As explained above, in order to drive a large number of LEDs as a display circuit of a microcomputer, this invention provides a display-only register, and uses a counter to sequentially read out the contents of this register to drive a driver to drive the LEDs. Since the content is displayed, the microcomputer only needs to access the dedicated register when the system wants to change the content currently displayed, so it can be displayed without using the microcomputer all the time.

Therefore, a large number of LEDs can be dynamically turned on by increasing the number of small-scale memory circuits that store detailed display programs.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of one embodiment of the display circuit of the present invention, and FIG.
The figure is a connection diagram showing one of the LEDs in the display circuit of Figure 1, Figure 3 is a signal waveform diagram of each part of the display circuit of Figure 1, and Figure 4 shows the optical display circuit of the present invention. A system configuration diagram showing an example of an applied air conditioner centralized monitoring device,
Figures 5 and 6 are external views showing the operation section (front) and rear side of the main unit in the air conditioner centralized monitoring system, respectively, and Figure 7 is the configuration of the terminal side of the air conditioner centralized monitoring system as above. Glock diagram, Figures 8(a) and 8(b) are external views of slave units in the air conditioner centralized monitoring system as above, Figure 9 is a circuit block diagram of the master unit and sub-master unit as above, Figure 10 Figure 11 is a circuit diagram showing the details of the power supply circuit in the air conditioner centralized monitoring device as above, Figure il1 is a circuit diagram showing the connection between the slave unit and the air conditioner, and Figure 12 is a circuit block diagram of the slave unit control circuit as above. , FIG. 13 is a flowchart for realizing the gatekeeping of the initial settings as above, and FIG. 14 is a flowchart 70- showing the procedure for starting operation from the parent device to each child device as above.
Figure 15 is a flowchart showing the procedure for controlling the air conditioner to run and stop by giving commands to the parent unit from outside the same EIA-R8232C standard interface, and Figure 16 is a flowchart showing the procedure for controlling the air conditioner to operate and stop the air conditioner from the outside. A flowchart showing the control procedure when an external thermostat for controlling the temperature of the machine is connected. Figure 17 is a flowchart showing the control procedure when two air conditioners are installed in one room. I'll go. 1... Master unit (central control unit that controls the entire system)
, ia... Sub-base unit (sub-central control unit), 2... Slave unit (terminal control unit f), 3... Air conditioner (air conditioner), 4
...Communication line, 5...Power switch, 6...Keypad switch, 7...-simultaneous operation switch, 8...W
@Sound speaker, 9...Gas leak alarm lamp, lO.
・・Operation alarm lamp, 11 ・・Communication alarm lamp, 12
... Operation request lamp, 13 ... Operation switch, 14
... External control lamp, 15 ... Operation command lamp, 1
6... Monitoring lamp, 20... Changeover switch, 21
... Connection connector for the parrot interface, 22.
...Setting switch, 28...External thermostat, 29...
Operation request switch, 30... Gas leak alarm, 35.
...Identification number setting switch, 38.61...Modulation/demodulation circuit, 39...Display circuit, 40.59...Microcomputer, 41...Switch input circuit, 42...
Power supply circuit, 43... Memory circuit, 44... Alarm sound generation circuit, 45... Stabilized power supply, 46... Comparison circuit, 4
7... Battery for power failure compensation, 48... Switching circuit, 5
0... Main switch, 51... Automatic/'manual changeover switch, 52... Self-holding relay, 53... Self-holding switch, 54... Control circuit, 57... Slave unit control circuit, 58... External input circuit, 60... Air conditioning connection circuit, 62... Identification number setting circuit, 70... Counter, 71-716... Reso star, 72... Decoder, 73□-734 . . . Driver, 82 . . . 1 ranking circuit. In the drawings, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa Figure 5 Figure 6 Figure 7 Figure 8 (a) Figure 8 (b) Figure 1O Figure 11 Figure 14 Figure 15 Figure 16 Procedure amendment (method), r4 I180 (IE915°

Claims (3)

[Claims] (1) A display-only register that stores light-emitting diodes to be lit in order to dynamically drive multiple diodes used for display in a system using a microcomputer, and a counter that sequentially reads out the contents of this register. , a driver that is driven by the output of the counter and lights up the light emitting diode according to the contents read from the register, and a driver that controls the drive of the driver by creating a time when none of the light emitting diodes are selected from the output of the counter. A display circuit comprising a blanking circuit. (2) The above display in a central monitoring system for air conditioners in which one or more air conditioners equipped with terminal control devices are installed in multiple rooms, and each terminal control device is centrally controlled by a central control device. 2. A display circuit according to claim 1, wherein the circuit is used in a central control unit. (3) A centralized monitoring system installs one or more air conditioners with terminal control devices in each of multiple rooms, centrally controls each terminal control device by the central control device, and standardizes it on the central control device. Connect an external microcomputer system through the interface circuit,
In an air conditioner monitoring system in which each terminal control device and the air conditioner can be controlled to stop operating through a central control device using control signals from the external microcomputer system, the display circuit is connected to the external microcomputer system. 2. The display circuit according to claim 1, wherein the display circuit is used for.